It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 18 709 is not a prime number.
For example, 18 709 can be divided by 53: 18 709 / 53 = 353.
For 18 709 to be a prime number, it would have been required that 18 709 has only two divisors, i.e., itself and 1.
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18 709 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 18 709 is about 136.781.
Thus, the square root of 18 709 is not an integer, and therefore 18 709 is not a square number.
The square of a number (here 18 709) is the result of the product of this number (18 709) by itself (i.e., 18 709 × 18 709); the square of 18 709 is sometimes called "raising 18 709 to the power 2", or "18 709 squared".
The square of 18 709 is 350 026 681 because 18 709 × 18 709 = 18 7092 = 350 026 681.
As a consequence, 18 709 is the square root of 350 026 681.
The multiples of 18 709 are all integers evenly divisible by 18 709, that is all numbers such that the remainder of the division by 18 709 is zero. There are infinitely many multiples of 18 709. The smallest multiples of 18 709 are: